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April 22, 2018 Weekly Geology Guest, Perlite

April 22, 2018

Greetings from the Bluff Park Back Porch, way up yonder on Shades Mountain (1,109′) in Alabama:


We will now continue down the Industrial Mineral dusty trail and continue with Perlite.

Perlite is an amorphousvolcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its low density after processing.

Perlite boulders with fireweed in foreground

RG JohnssonU.S. National Park Service, Yellowstone Slide Files, Geology Images/Volcanic – Igneous, #02316

Expanded perlite


Image result for perlite images

Image result for perlite images

Enjoy the adventure!





Our next industrial mineral challenge will be phosphates.



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